Practice free for as long as you like. Pay when you want the whole library, the project builder and the interview.
One price for everything. There is no team tier, no seat count and nothing held back for an enterprise plan, because there is only one product and you are looking at it.
Enough to find out whether this works for you, with no card.
For a focused stretch of interview prep. Cancel whenever.
Everything monthly has. Pays for itself in ten months, then stops.
Most practice sites sell you more problems. The problems are the cheap part: they are on the internet for nothing. What is hard to get is the part after the green check mark, and that is what is behind this: a project that grows out of the puzzle you just solved and exports as a folder that runs, an interviewer that watches you solve, asks why you did it that way and writes you up the way a hiring manager would, and a rating that only moves when your solution is re-run on a server rather than trusted from your browser.
Press Software Engineer on any puzzle and three more modules stack under the solution you just wrote, each a real algorithm with its own brief and its own tests. Finish them and you have a working program with a pipeline, a test suite and a README, and you can download the whole folder. The project is chosen from the puzzle's own pattern, so the thing you just wrote is module one rather than a warm-up that gets thrown away. It works in Python, JavaScript and C++.
Press Interview me on any puzzle at level 3 and the clock starts against a par time for its difficulty. The interviewer watches how you work: it checks in on a silent start, asks for a time check at halfway, notices when you rerun failing code without changing anything, and asks what clicked when you break through. Then it reads what you submitted: a loop inside a loop gets asked about quadratic cost, a function that sorts its argument gets asked what the caller sees afterwards. It ends with a hiring manager's scorecard: five areas rated with the evidence behind each, a timeline of the session, and a verdict from No hire to Strong hire.
Every solution in the library comes with a note on every line, written for that language rather than translated: what each name holds, why a bound is <= and not <, why this line comes before that one, and which input would break it if it were missing. The last note gives the cost and the trade-off being made. In the jigsaw the notes assemble as the pieces do, so the explanation builds alongside the code, and the replay steps through them as the solution runs.
Finish a ranked run and your code is re-run on the server rather than trusted from the browser, then a Glicko-2 rating moves. That is the same system chess uses, and it is why the leaderboard is worth being on: a position on it cannot be earned by editing anything in your own browser.
The bootcamp is a written course through the patterns interviews keep asking about, each lesson followed by the puzzles that use what you just read. Finish a path and there is a certificate with a verification link you can hand to somebody, which resolves to a page that confirms it rather than to a picture of a badge.
Assemble it from jigsaw pieces, fill in the blanks of a skeleton, or type it from scratch against its tests. The first is for learning a pattern you have never seen, the last is for rehearsing one under pressure, and the same problem serves both. Every solution comes with a step by step replay of how it actually ran.
Yes, and it is not a trial that expires. Six puzzles need no account at all and seven more open the moment you make one, all three ways to solve, all three languages, with the replay. You also get one full Software Engineer project on whichever puzzle you choose. Nothing expires and no card is involved.
$4.99 a month, or $49 once for permanent access. Both unlock exactly the same thing. There is no tier above them.
Monthly, if you are preparing for interviews in a defined window, which is most people: six to ten weeks of practice costs about thirty dollars and then you stop paying. Forever, if you would rather not think about it again, or if you expect to come back to this every time you change jobs. Forever costs the same as ten months.
Yes, in two clicks from your billing page, and you keep access until the end of the period you have already paid for. Anything you exported from the project builder is a folder on your own machine and is yours regardless.
The code you exported is a normal folder of source files with a README and a test suite. It runs without this site and it does not check in with anything. Nothing about it stops working.
It is a single payment with no renewal and no expiry, and it covers puzzles added after you buy. It is not a promise that this site outlives the sun: it is a promise that the account is not billed again and is not downgraded.
The free tier is the student discount, and it is a permanent one. If $49 is genuinely the obstacle, write in and say so.
No. Checkout is handled by Stripe and card details never touch this server. What is stored here is a customer id, which is what lets the billing page show you an invoice history.
How the AI mock interview works, the DSA bootcamp, or browse all 546 practice puzzles.